/*
 * Copyright 2006 Matt Jensen
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License.
 */
package org.spectaql.internal.proxy.cglib;

import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

import java.lang.reflect.Method;

/**
 * <p>
 * <code>ToStringMethodCallback</code> is an implementation of the CGLib {@link MethodInterceptor} interface which
 * handles invocations of {@link Object#toString()} on proxy objects.
 * </p>
 */
class ToStringMethodCallback implements MethodInterceptor
{
    /**
     * <p>
     * Construct a {@link ToStringMethodCallback} instance.
     * </p>
     */
    private ToStringMethodCallback()
    {
        super();
    }

    /* inherit javadoc */
    public Object intercept(final Object instance,
                            final Method method,
                            final Object[] arguments,
                            final MethodProxy methodProxy)
            throws Throwable
    {
        final Class<?> entityClass = instance.getClass().getSuperclass();
        return String.format("Proxy for %s [%s]", entityClass.getName(), methodProxy.invokeSuper(instance,
                arguments));
    }

    /**
     * <p>
     * Singleton instance. 
     * </p>
     */
    public static final MethodInterceptor INSTANCE = new ToStringMethodCallback();
}
